33results about How to "No follow-up" patented technology

Disclosed is a preparation method of a hexagon snow shaped WO3 nanometer disc. Firstly, tungsten powder is added into hydrogen peroxide solution, after the reaction is finished, filtrate in a beaker is collected and labeled as solution A. Deionized water is added into the solution A and the solution A is diluted to obtain solution B; the solution B is poured into a microwave hydrothermal reactor, and then is put into a MDS-8 type temperature-pressure double control microwave hydrothermal reaction machine. The temperature control mode is selected for reaction, after the reaction is finished, the solution B is cooled to the room temperature naturally. The hydrothermal reactor is opened, after the product is centrifugated, supernatant is removed and precipitate is collected, then the product is rinsed a plurality of times by using deionized water and absolute ethanol or deionized water and isopropanol, at last the product is soaked in absolute ethanol, and is dried in an electrothermal blowing dry box, then the snow shaped WO3 nanometer disc is obtained. The reaction of the invention is finished by one step, the subsequent treatment is not needed, the preparation period is short, and the process equipment is simple, the cost is low, the repeatability is high, the reaction temperature is low, the energy consumption is low and the production cost is saved.

The invention belongs to the technical field of polymer foam materials, and particularly relates to a flame-retardant polyurethane foam preparation method, which comprises: 1, adding polylol into a reaction kettle, adjusting the pH value to 7-13, and heating to achieve a temperature of 50-90 DEG C; 2, adding paraformaldehyde, maintaining the constant temperature for 10-40 min, and carrying out depolymerization and dissolving on paraformaldehyde under an alkaline condition; 3, adding an amino-based substance, controlling the reaction temperature at 50-100 DEG C, and carrying out a reaction for60-180 min; 4, adjusting the pH value to 2-7, and carrying out a condensation and etherification reaction for 20-50 min; and 5, adjusting the pH value to 7-13, adding a modifier, controlling the reaction temperature at 60-100 DEG C, and carrying out a reaction for 90-200 min to obtain the flame-retardant polyol. According to the present invention, the flame-retardant polyurethane foam material prepared through the preparation method has advantages of high compressive strength, good flame retardant effect and the like, and has good application prospects in industry, daily life, architecture andother external wall thermal insulation material markets.

The invention provides titanium dioxide with a high-energy surface hollow structure, which is characterized in that metal titanium powder and hydrogen fluoride are directly reacted with an aqueous solution of hydrogen peroxide to obtain titanium dioxide which possesses the hollow structure and is formed by high-energy surface flake particle reunion with particle size of 1-3 micrometers, a preparation method comprises the following steps: mixing hydrofluoric acid and the hydrogen peroxide solution according to proportion of 1-20:30-600, adding the metal titanium powder in the mixed solution, wherein the addition is that every milliliter mixed solution adds 0.006-0.12g metal titanium powder, stirring for 5 minutes; and adding deionized water in the stirred mixed solution according to proportion of 1-20:9-180, putting into a teflon-lined hydrothermal autoclave, reacting for 4-40 hours at the temperature of 160-200 DEG C, washing by deionized water and drying. The present invention enables simple method without a templating agent or a surfactant and further treatment, and is easy to recycle and use in practical application; the invention has the advantages of novel structure, structured size and well crystallization.

The invention belongs to the technical field of preparation of carbon quantum dot materials, and discloses a method for synthesizing solid carbon quantum dots by gaseous detonation. The method comprises the following specific steps: taking citric acid as a carbon source, taking urea as a nitrogen source, mixing the two substances and tiling into a gaseous detonation tube; sealing the gaseous detonation tube and then vacuumizing; simultaneously heating the gaseous detonation tube to 60 DEG C or above; respectively filling the inner part of the gaseous detonation tube with hydrogen and oxygen asa detonation source; stopping heating the gaseous detonation tube and detonating hydrogen and oxygen mixed gas in the tube; after the gaseous detonation tube is cooled to 80 DEG C or less, opening the gaseous detonation tube and collecting yellow solid on the tube wall, namely the solid carbon quantum dots. The method has the advantages of simplicity, high efficiency, no need of subsequent processing and capability of synthesizing the solid carbon quantum dots on a large scale. The solid carbon quantum dots synthesized by the method disclosed by the invention do not need any matrix, and can emit fluorescence directly under the excitation of an ultraviolet lamp.

The invention discloses an improved process method for preparing 5-chloroindanone, and belongs to the technical field of organic synthesis. The method comprises the following steps: mixing chlorobenzene with anhydrous aluminum trichloride, adding 3-chloropropionyl chloride, and carrying out Friedel-Crafts acylation reaction to obtain 3,4'-dichloropropiophenone; then carrying out catalytic cyclization under the condition of anhydrous aluminum trichloride/sodium chloride or tri(pentafluorophenyl)borane; and after the reaction is finished, washing the product with water and directly rectifying the product to obtain the 5-chloroindanone. According to the process disclosed by the invention, the direct distillation is performed after water washing, so that no subsequent operation is performed, the operation steps are reduced, the production time is shortened, the production cost is saved, the extraction effect of the product is greatly improved, the yield of the product is improved by 15% or above, low-boiling-point substances and high-boiling-point substances can be effectively removed through direct distillation, and the content of the product is improved to 99.5% or above; meanwhile, cyclization is carried out under catalysis of tri(pentafluorophenyl)borane, so that the total dosage of aluminum trichloride can be reduced, the cyclization reaction temperature is reduced, the generation of tar is reduced, and the yield of the product is improved.

The invention belongs to the technical field of soil remediation, and particularly relates to a method for remediating heavy metal contaminated soil by a cyclodextrin reinforced modifier. The method comprises the following steps of: (1) adding the cyclodextrin reinforced modifier into the contaminated soil according to a weight ratio of 1:(8-10), uniformly mixing the substances, and regularly performing watering to keep the soil moist; and (2) setting a passivation period of 2-4 months, and periodically determining the content of DTPA extractable heavy metals in the soil within 120 days of passivation remediation. The efficient adsorption and enrichment effects of cyclodextrin on heavy metals are fully utilized, the passivation effect on the heavy metals in the contaminated soil is enhanced, and the remediation efficiency of the heavy metal contaminated soil is improved.

The invention discloses a rotary excavating tooth body surface strengthening laser dispersion alloying method. The method comprises the following steps that (1) a rotary excavating tooth obtained after surface treatment is clamped in a chuck of a laser machining machine tool, and wild phase powder is contained in a powder feed device; and (2) the height direction of a rotary excavating tooth body is used as the feed direction of a laser head of a laser device, the laser head emits lasers, the powder feed device synchronously feeds powder, the feed speed of the laser head cooperates with the speed of rotation of the rotary excavating tooth driven by the chuck, a micro melting pool is formed on the surface of the rotary excavating tooth body according to a preset motion track, the micro melting pool coats wild phase particles in the subsequent fast cooling and solidifying process, and an alloy strengthening micro area is formed. According to the method, the toughness of a rotary excavating tooth base material can be kept, and meanwhile the surface wear resistance of the tooth body can be improved.

The invention relates to a composition for detecting mycobacterium tuberculosis and/or brucella. The composition includes primers and probes for detecting mycobacterium tuberculosis and/or brucella, wherein the primers include the sequences shown in SEQ ID NO.1-SEQ ID NO.4, and the probes include the sequences shown in SEQ ID NO.5-SEQ ID NO.6. The invention further relates to a kit comprising thecomposition and application of the composition. The kit performs amplification product detection in a closed-tube state, so that false positives caused by contamination of an amplification product isavoided; the probe hybridization specificity is higher; the detection of the two bacteria of mycobacterium tuberculosis and/or brucella can be simultaneously achieved, the detection time is greatly shortened, and the detection cost is reduced; and after PCR is carried out, no subsequent processing is required, the operation is simpler and faster, safe and pollution-free, the detection is high in specificity, sensitive, fast and safe, and the detection effect on samples containing trace amounts of mycobacterium tuberculosis and/or brucella genomes is good.

The invention relates to a murine cytomegalovirus real-time fluorescent quantitative PCR detection method comprising the following steps of: standard plasmid construction, specific primer and fluorescent probe design, real-time fluorescent quantitative PCR amplification and detection standard curve establishment, RNA extraction of an infected virus sample, cDNA preparation and validity verification and result detection judgment, wherein the sequence of a forward primer of a specific primer is shown as follows: 5'-AGCGTCGATGCAGGGGCTTT-3', and the sequence of a reverse primer thereof is shown as follows: 5'-CGGCGGAACGGGGGCTGGTA-3'; and the sequence of a fluorescent probe is shown as follows: 5'-CGGGGGCGTTCCGAAAACGA-3'. The invention has the advantages of high detection sensitivity, short detection time, good specificity, sensibility, repeatability and stability, can be simultaneously used for carrying out sample analysis on a large scale and is suitable for the early diagnosis of virus infection.

The method of using organic acid wastewater to prepare biomass hydrothermal coke, according to the method, the biomass and organic acid wastewater are fully mixed in a mass ratio of 1:10 to 30, and every 3 to 5 hours at room temperature, after 50 ~ 500r/min mixer stirring for 5 ~ 10 minutes, after 12 ~ 24 hours, through 5000 ~ 10000r/min pulverizer treatment for 10 ~ 15 minutes, sent to the reaction kettle, and into the kettle into the CO ₂ Evacuate the air, use infrared heating with a wavelength of 5-16 μm, the reaction temperature is 250-300 ° C, the reaction time is 180-240 minutes, and the pressure is at least the saturation pressure of water corresponding to the reaction temperature. After the reaction is completed, squeeze and separate , to obtain extremely low ash porous hydrothermal coke. The invention makes full use of the organic acid waste water to effectively remove the ash content of the biomass in the hydrothermal carbonization process, and simultaneously activates the hydrothermal coke, with simple process, low energy consumption and less emission.

The invention aims to provide a preparation method of an N-doped nano lamellar graphite structure or an N-doped nano lamellar graphite structure loaded with Fe2O3 nanoparticles on the surface. A high-temperature plasma arc evaporation technology is adopted for preparation. A high-purity graphite rod is used as a cathode, a high-purity graphite rod or a mixed block of high-purity Fe powder and high-purity graphite powder is used as an anode, after the electric arc furnace is vacuumized, acetonitrile is introduced to serve as a carbon source and a nitrogen source, and after plasma arc dischargeis finished, sediments on the inner wall of a reaction cavity are collected to obtain wrinkled N-doped nano lamellar graphite of a large sheet layer, or Fe2O3 nanoparticle compounds are uniformly dispersed on the wrinkled N-doped nano lamellar graphite of the large sheet layer. A large number of the products can be prepared by using a simple and harmless high-temperature plasma arc evaporation method without any reaction gas, and the doping of an N element enables the nano lamellar graphite to be disordered and filled with a large number of defects, so that the nano lamellar graphite is certainly induced to generate new performance, and the nano lamellar graphite can be widely applied to wave absorption and other fields.